package com.common.app.widget;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;

import com.google.zxing.ResultPoint;
import com.journeyapps.barcodescanner.ViewfinderView;

import java.util.Collection;
import java.util.HashSet;
import com.common.app.R;

public class CustomZxingView extends ViewfinderView {

    /**
     * 刷新界面的时间
     */
    private static final long ANIMATION_DELAY = 10L;
    private static final int OPAQUE = 0xFF;

    /**
     * 四个绿色边角对应的长度
     */
    private int ScreenRate;
    private int ScreenRate2;

    /**
     * 四个绿色边角对应的宽度
     */
    private static final int CORNER_WIDTH = 2;
    private static final int CORNER_WIDTH2 = 8;

    /**
     * 中间那条线每次刷新移动的距离
     */
    private static final int SPEEN_DISTANCE = 10;

    /**
     * 手机的屏幕密度
     */
    private static float density;

    /**
     * 画笔对象的引用
     */
    private Paint paint;

    /**
     * 中间滑动线的最顶端位置
     */
    private int slideTop;

    /**
     * 中间滑动线的最底端位置
     */
    private int slideBottom;

    /**
     * 将扫描的二维码拍下来，这里没有这个功能，暂时不考虑
     */
    private Bitmap resultBitmap;
    private final int maskColor;
    private final int resultColor;

    private final int resultPointColor;
    private Collection<ResultPoint> possibleResultPoints;
    private Collection<ResultPoint> lastPossibleResultPoints;

    boolean isFirst;

    public CustomZxingView(Context context, AttributeSet attrs)
    {
        super(context, attrs);

        density = context.getResources().getDisplayMetrics().density;
        //将像素转换成dp
        ScreenRate = (int) (250 * density);
        ScreenRate2 = (int) (16 * density);

        paint = new Paint();
        Resources resources = getResources();
        maskColor = resources.getColor(R.color.transparent_b2);
        resultColor = resources.getColor(R.color.transparent_b0);

        resultPointColor = resources.getColor(R.color.color_694A09);
        possibleResultPoints = new HashSet<ResultPoint>(5);
    }

    @Override
    public void onDraw(Canvas canvas)
    {
        refreshSizes();
        if (framingRect == null) {
            return;
        }

        Rect frame = framingRect;

        //初始化中间线滑动的最上边和最下边
        if (!isFirst)
        {
            isFirst = true;
            slideTop = frame.top;
            slideBottom = frame.bottom;
        }

        //获取屏幕的宽和高
        int width = canvas.getWidth();
        int height = canvas.getHeight();

        paint.setColor(resultBitmap != null ? resultColor : maskColor);
        //画出扫描框外面的阴影部分，共四个部分，扫描框的上面到屏幕上面，扫描框的下面到屏幕下面
        //扫描框的左边面到屏幕左边，扫描框的右边到屏幕右边
        canvas.drawRect(0, 0, width, frame.top, paint);
        canvas.drawRect(0, frame.top, frame.left, frame.bottom, paint);
        canvas.drawRect(frame.right , frame.top, width, frame.bottom,
                paint);
        canvas.drawRect(0, frame.bottom, width, height, paint);


        if (resultBitmap != null)
        {
            // Draw the opaque result bitmap over the scanning rectangle
            paint.setAlpha(OPAQUE);
            canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);
        } else
        {

            //画扫描框边上的角，总共8个部分
//            paint.setColor(Color.WHITE);
//            canvas.drawRect(frame.left, frame.top, frame.left + ScreenRate,
//                    frame.top + CORNER_WIDTH, paint);
//            canvas.drawRect(frame.left, frame.top, frame.left + CORNER_WIDTH, frame.top
//                    + ScreenRate, paint);
//            canvas.drawRect(frame.right - ScreenRate, frame.top, frame.right,
//                    frame.top + CORNER_WIDTH, paint);
//            canvas.drawRect(frame.right - CORNER_WIDTH, frame.top, frame.right, frame.top
//                    + ScreenRate, paint);
//            canvas.drawRect(frame.left, frame.bottom - CORNER_WIDTH, frame.left
//                    + ScreenRate, frame.bottom, paint);
//            canvas.drawRect(frame.left, frame.bottom - ScreenRate,
//                    frame.left + CORNER_WIDTH, frame.bottom, paint);
//            canvas.drawRect(frame.right - ScreenRate, frame.bottom - CORNER_WIDTH,
//                    frame.right, frame.bottom, paint);
//            canvas.drawRect(frame.right - CORNER_WIDTH, frame.bottom - ScreenRate,
//                    frame.right, frame.bottom, paint);

            //画扫描框边上的角，总共8个部分
//            paint.setColor(getResources().getColor(R.color.color_FF694A09));
//            canvas.drawRect(frame.left, frame.top, frame.left + ScreenRate2,
//                    frame.top + CORNER_WIDTH2, paint);
//            canvas.drawRect(frame.left, frame.top, frame.left + CORNER_WIDTH2, frame.top
//                    + ScreenRate2, paint);
//            canvas.drawRect(frame.right - ScreenRate2, frame.top, frame.right,
//                    frame.top + CORNER_WIDTH2, paint);
//            canvas.drawRect(frame.right - CORNER_WIDTH2, frame.top, frame.right, frame.top
//                    + ScreenRate2, paint);
//            canvas.drawRect(frame.left, frame.bottom - CORNER_WIDTH2, frame.left
//                    + ScreenRate2, frame.bottom, paint);
//            canvas.drawRect(frame.left, frame.bottom - ScreenRate2,
//                    frame.left + CORNER_WIDTH2, frame.bottom, paint);
//            canvas.drawRect(frame.right - ScreenRate2, frame.bottom - CORNER_WIDTH2,
//                    frame.right, frame.bottom, paint);
//            canvas.drawRect(frame.right - CORNER_WIDTH2, frame.bottom - ScreenRate2,
//                    frame.right, frame.bottom, paint);


            //绘制中间的线,每次刷新界面，中间的线往下移动SPEEN_DISTANCE

//            slideTop += SPEEN_DISTANCE;
//            if (slideTop >= frame.bottom)
//            {
//                slideTop = frame.top;
//            }
//            Rect lineRect = new Rect();
//            lineRect.left = frame.left;
//            lineRect.right = frame.right;
//            lineRect.top = slideTop;
//            lineRect.bottom = slideTop + 18;
//            canvas.drawBitmap(((BitmapDrawable) (getResources().getDrawable(R.drawable.qrcode_scan_line))).getBitmap(), null, lineRect, paint);


            Collection<ResultPoint> currentPossible = possibleResultPoints;
            Collection<ResultPoint> currentLast = lastPossibleResultPoints;
            if (currentPossible.isEmpty())
            {
                lastPossibleResultPoints = null;
            } else
            {
                possibleResultPoints = new HashSet<ResultPoint>(5);
                lastPossibleResultPoints = currentPossible;
                paint.setAlpha(OPAQUE);
                paint.setColor(resultPointColor);
                for (ResultPoint point : currentPossible)
                {
                    canvas.drawCircle(frame.left + point.getX(), frame.top
                            + point.getY(), 6.0f, paint);
                }
            }
            if (currentLast != null)
            {
                paint.setAlpha(OPAQUE / 2);
                paint.setColor(resultPointColor);
                for (ResultPoint point : currentLast)
                {
                    canvas.drawCircle(frame.left + point.getX(), frame.top
                            + point.getY(), 3.0f, paint);
                }
            }


            //只刷新扫描框的内容，其他地方不刷新
            postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top,
                    frame.right, frame.bottom);

        }
    }

    public void drawViewfinder()
    {
        resultBitmap = null;
        invalidate();
    }

    /**
     * Draw a bitmap with the result points highlighted instead of the live
     * scanning display.
     *
     * @param barcode An image of the decoded barcode.
     */
    public void drawResultBitmap(Bitmap barcode)
    {
        resultBitmap = barcode;
        invalidate();
    }

    public void addPossibleResultPoint(ResultPoint point)
    {
        possibleResultPoints.add(point);
    }
}
